Add a Slack notify step in CI

Author: chadell

.github/workflows/ci.yml

@@ -203,3 +203,39 @@ jobs:
           password: "${{ secrets.PYPI_API_TOKEN }}"
     needs:
       - "unittest"
+  slack-notify:
+    needs:
+      - "publish_gh"
+      - "publish_pypi"
+    name: "Send notification to the Slack"
+    runs-on: "ubuntu-20.04"
+    env:
+      SLACK_WEBHOOK_URL: "${{ secrets.SLACK_WEBHOOK_URL }}"
+      SLACK_MESSAGE: >-
+        *NOTIFICATION: NEW-RELEASE-PUBLISHED*\n
+        Repository: <${{ github.server_url }}/${{ github.repository }}|${{ github.repository }}>\n
+        Release: <${{ github.server_url }}/${{ github.repository }}/releases/tag/${{ github.ref_name }}|${{ github.ref_name }}>\n
+        Published by: <${{ github.server_url }}/${{ github.actor }}|${{ github.actor }}>
+    steps:
+      - name: "Send a notification to Slack"
+        # ENVs cannot be used directly in job.if. This is a workaround to check
+        # if SLACK_WEBHOOK_URL is present.
+        if: "${{ env.SLACK_WEBHOOK_URL != '' }}"
+        uses: "slackapi/slack-github-action@v1.23.0"
+        with:
+          payload: |
+            {
+              "text": "${{ env.SLACK_MESSAGE }}",
+              "blocks": [
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": "${{ env.SLACK_MESSAGE }}"
+                  }
+                }
+              ]
+            }
+        env:
+          SLACK_WEBHOOK_URL: "${{ secrets.SLACK_WEBHOOK_URL }}"
+          SLACK_WEBHOOK_TYPE: "INCOMING_WEBHOOK"